ELLIPTIC EQUATIONS WITH ABSORPTION IN A HALF-SPACE
Résumé
We give a necessary and sufficient condition, in the spirit of the clas-sical works by Keller and Osserman, for the elliptic equation ∆u = f (u) to have a solution in a half-space of R N . The function f is supposed to be nondecreasing and nonnegative, and we are interested in solutions whose range is where f > 0.
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